1. Mary was preparing her Geogaphy project . 2.Mary wasn't preparing her Geogaphy project . 3. Was Mary preparing her Geogaphy project ? 4. Bob was surfing the net. 5. Bob wasn't surfing the net .6. Was Bob surfing the net? 7. The boy was walking with his dog. 8. The boy wasn't walking with his dog. 9 Was the boy walking with his dog? 10. My dad was painting the bathroom. 11. My dad wasn't painting the bathroom . 12. Was my dad painting the bathroom? 13. I was enjoying this party. 14. I wasn't enjoying this party.15. Were you enjoying this party?
16. The President visited the Olympics. 17. The President didn't visit the Olympics. 18. Did the President visit the Olympics? 19. Susan liked skiing. 20. Susan didn't like skiing. 21. Did Sue like skiing? 22. They were at the theatre. 23. They weren't at the theatre. 24. Were they at the theatre? 25. The flood destroyed the bridge. 26. The flood didn't destroy the bridge. 27. Did the flood destroy the bridge. 28. Last week our relatives bought a new car. 29. Last week our relatives didn't buy a new car. 30. Did your relatives buy a new car last week?
Entry and accumulation in the environment of different substances and compounds in concentrations exceeding the natural (background ) level . Environmental pollution in DOS. associated with industrial activity of man , although sometimes it is due to natural causes ( volcanoes , dust storms , forest fires , etc.). DOS. contaminants - industrial enterprises (especially metallurgical and chemical ) , combined heat and power , transport , urban and agriculture . In Russia, large pockets of air pollution generated in the industrial centers (Norilsk , Magnitogorsk , Lipetsk and Cherepovets, Nizhny Tagil , etc.) and cities - millionaires . In large cities, pollution by 70% due to the exhaust of vehicles , which contain approx. 200 toxic substances (including carbon monoxide, nitrogen oxides , lead compounds ) . In cities and their surroundings loss occurs ( precipitation ) of atmospheric pollutants on the ground, which leads to the formation of geochemical anomalies. Some heavily polluted river - cf. During the Volga , Don , rivers of the Kola Peninsula , the lower reaches of the Amur.Environmental pollution by industrial enterprisesEnvironmental pollution by industrial enterprises Pollution affects the health of humans, causing a number of serious diseases. Pollution levels monitored values of maximum permissible concentration (MPC) , the maximum permissible emissions (MPE ), etc. The greatest threat to the health of the radioactive contamination of the environment - the result of accidents at nuclear power plants in the world and conducted nuclear tests in 1850 . Especially dangerous isotopes of cesium and strontium that accumulate in the soil and reach the food chain to humans. Also radionuclides have mutagenic pesticides and heavy metals . Environmental contamination can be solved as a result of monitoring the state of the environment , comprehensive utilization of resources , the introduction of low-and non-waste production , the creation of sewage treatment plants
16. The President visited the Olympics. 17. The President didn't visit the Olympics. 18. Did the President visit the Olympics? 19. Susan liked skiing. 20. Susan didn't like skiing. 21. Did Sue like skiing? 22. They were at the theatre. 23. They weren't at the theatre. 24. Were they at the theatre? 25. The flood destroyed the bridge. 26. The flood didn't destroy the bridge. 27. Did the flood destroy the bridge. 28. Last week our relatives bought a new car. 29. Last week our relatives didn't buy a new car. 30. Did your relatives buy a new car last week?